package com.zzg.springboot;

import java.util.Map;

import javax.persistence.EntityManager;
import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef="entityManagerFactoryPrimary", // 实体管理器引用
        transactionManagerRef="transactionManagerPrimary", // 事务管理器引用
        basePackages = { "com.zzg.springboot.dao.user"}) // 设置用户数据源所应用到的包
public class UserDataSourceConfigurer {
	  @Autowired
	    private JpaProperties jpaProperties;

	    @Autowired
	    @Qualifier("primaryDS")
	    private DataSource primaryDS;

	    @Bean(name = "entityManagerPrimary")
	    @Primary
	    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
	        return entityManagerFactoryPrimary( builder ).getObject( ).createEntityManager( );
	    }

	    @Bean(name = "entityManagerFactoryPrimary")
	    @Primary
	    public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {
	        return builder
	                .dataSource( primaryDS )
	                .properties( getVendorProperties( primaryDS ) )
	                .packages( "com.zzg.springboot.dao.user" ) //设置实体类所在位置
	                .persistenceUnit( "primaryPersistenceUnit" )
	                .build( );
	    }

	    private Map<String, String> getVendorProperties(DataSource dataSource) {
	        return jpaProperties.getHibernateProperties( dataSource );
	    }

	    @Bean(name = "transactionManagerPrimary")
	    @Primary
	    PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
	        return new JpaTransactionManager( entityManagerFactoryPrimary( builder ).getObject( ) );
	    }
}
